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Clinical Anatomy of the Breast

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Clinical Anatomy of the Breast ClinicalClinical AnatomyAnatomy ofof thethe BreastBreast Dr. Roger A. Dashner Clinical Anatomist & CEO Advanced Anatomical Services Adjunct Associate Professor OU College of Health Sciences & Professions IntroductionIntroduction toto thethe BreastBreast • Breasts (mammary glands) = modified sweat glands • Lie in supf. fascia ant. to deep fascia of pec. major • Btwn. glands & deep fascia is retromammary space • (i.e., loose CT plane allowing free movement) • Thus, glands NOT firmly attached to deep fascia Suspensory (Cooper’s) Ligaments •Glands ARE firmly attached to skin via CT • Fibrous septa anchor deep layer of skin to deep fascia • These CT septa are called suspensory ligs. Pec.Pec. FasciaFascia && Susp.Susp. Ligs.Ligs. Structure of the Breast • Compartmentalized fat bounded by CT septa • Glandular lobules drained by 15-20 lactiferous ducts • Lactiferous ducts converge & open onto nipple • Areola surrounds nipple & conceals sebaceous glands • (i.e., produce lubrication for nipple) CompartmentalizationCompartmentalization GlandGland LobulesLobules && Lac.Lac. DuctsDucts FourFour QuadrantsQuadrants ofof thethe BreastBreast • Upper outer (superolateral) quadrant • Upper inner (superomedial) quadrant • Lower outer (inferolateral) quadrant • Lower inner (inferomedial) quadrant 44 QuadrantsQuadrants ofof thethe BreastBreast ClinicalClinical NotesNotes onon BreastBreast CancerCancer • Majority of cancers develop in upper outer quadrant • Large amount of glandular tissue here •An axillary tail of breast tissue often extends into axilla AxillaryAxillary TailTail ofof thethe BreastBreast EarlyEarly BreastBreast CarcinomaCarcinoma AdvancedAdvanced BreastBreast CancerCancer • Tumors may grow thru retromammary space • Subsequently invade deep fascia & pec. major m. • Leads to fixation of malignant breast lesion to chest wall • Shortens suspensory (Cooper’s) ligs. • Leads to irregular dimpling of skin or retraction of nipple AdvancedAdvanced CarcinomaCarcinoma FourFour BoundariesBoundaries forfor aa MastectomyMastectomy • Clavicle – superior boundary • Inframammary fold (above rectus sheath) – inferior boundary • Sternum (midline) – medial boundary • Latissimus dorsi (ant. border) – lateral boundary MastectomyMastectomy BoundariesBoundaries TheThe AxillaAxilla ContentsContents ofof thethe AxillaAxilla • Axillary sheath (axillary a. & brachial plexus) • Axillary v. & lymphatics (outside sheath) • Fat & connective tissue • Cutaneous nerves ContentsContents ofof thethe AxillaAxilla TheThe AxillaryAxillary ArteryArtery •Arises from subclavian a. at lat. border of 1st rib • Becomes brachial a. at infr. border of teres major • Surrounded by cords & brs. of brachial plexus • Can be divided into 3 parts relative to pec. minor AxillaryAxillary ArteryArtery (Exposed)(Exposed) AxillaryAxillary ArteryArtery (Concealed)(Concealed) 33 PartsParts ofof thethe AxillaryAxillary ArteryArtery • Part 1 –btwn. 1st rib & pec. minor • (i.e., gives off supr. thoracic a.) • Part 2 – deep to pec. minor • (i.e., gives off thoracoacromial & lat. thoracic aa.) • Part 3 – btwn. pec. minor & teres major • (i.e., gives off subscapular, ant. & post. circ. humeral aa.) 33 PartsParts ofof thethe AxillaryAxillary A.A. VesselsVessels ofof thethe BreastBreast • Enter from supr./med. & supr./lat. aspects • Penetrate deep surface of breast • Exhibit extensive brs. & anastomoses AnastomosesAnastomoses ofof thethe BreastBreast ArterialArterial SupplySupply ofof thethe BreastBreast • Lateral (mammary) thoracic a. • Internal (mammary) thoracic a. • Intercostal aa. • Thoracoacromial a. LateralLateral (Mammary)(Mammary) ThoracicThoracic ArteryArtery • Branch of axillary a. (under pec. minor) • Located along lat. aspect of thorax • Supplies lat. thorax & lat. mammary gland • Specific blood supply from lat. mammary brs. • Runs with lat. thoracic v. & long thoracic n. • Vein is a tributary to axillary v. InternalInternal (Mammary)(Mammary) ThoracicThoracic ArteryArtery • Branch of subclavian a. • Located inside thorax just lat. to sternum • Descends vertically across intercostal spaces • Supplies ant. thorax & med. mammary gland • Specific blood supply from med. mammary brs. • Runs with int. thoracic v. • Vein is a tributary to brachiocephalic v. LateralLateral && InternalInternal ThoracicThoracic Aa.Aa. LateralLateral && InternalInternal ThoracicThoracic Vv.Vv. IntercostalIntercostal ArteriesArteries •Brs. of aorta or int. (mammary) thoracic aa. • Located in intercostal spaces (btwn. ribs) • Supply ant., post. & lat. thorax & breast • Specific blood supply is from lat. mammary brs. • (i.e., lat. cutaneous brs. of post. intercostal aa.) • Run with intercostal vv. & nn. • Veins are tributaries to azygos v. or int. thoracic v. LateralLateral MammaryMammary Brs.Brs. IntercostalIntercostal ArteriesArteries IntercostalIntercostal VeinsVeins ThoracoacromialThoracoacromial ArteryArtery • Branch of axillary a. (under pec. minor) • Located in ant. shoulder region • Sends off 4 subsequent brs. • Not generally major source of blood supply to breast FourFour BranchesBranches ofof thethe ThoracoacromialThoracoacromial ArteryArtery • Pectoral br. – supplies pectoral region & upper breast • Clavicular br. – supplies clavicle region • Acromial br. – supplies upper shoulder region • Deltoid br. – supplies lower shoulder region • All accompanying vv. are tributaries to axillary v. ThoracoacromialThoracoacromial ArteryArtery AdditionalAdditional VenousVenous DrainageDrainage ofof thethe BreastBreast • Cephalic v. CephalicCephalic VeinVein • Tributary to axillary v. •Only major supf. v. in vicinity of breast • Primarily drains UL into deltopectoral triangle • Some supf. venous drainage of breast CephalicCephalic VeinVein NervesNerves ofof thethe BreastBreast • Cutaneous innervation • Medial pectoral n. • Lateral pectoral n. • Long thoracic n. CutaneousCutaneous InnervationInnervation • Via general sensory brs. of T1-T6 • (i.e., lat. & ant. cutaneous brs. of intercostal nn.) • Note: T2 is of specific clinical significance CutaneousCutaneous InnervationInnervation IntercostobrachialIntercostobrachial NerveNerve • Lat. cutaneous branch of T2 • Emerges from 2nd intercostal space • Supplies skin on med. & post. arm • Assoc. with referred pain from angina or heart attacks • Heart symp. nn. carry afferents back to upper thoracic cord • Visceral heart pain referred to somatic thoracic nn. IntercostobrachialIntercostobrachial NerveNerve MedialMedial PectoralPectoral NerveNerve • Branch of med. cord of brachial plexus • Derived from ventral rami of C8-T1 • Pierces pec. minor to enter pec. major • Supplies pec. minor & part of pec. major LateralLateral PectoralPectoral NerveNerve • Branch of lat. cord of brachial plexus • Derived from ventral rami of C5-C7 • Runs above pec. minor to enter pec. major • Supplies remainder of pec. major Med.Med. && Lat.Lat. PectoralPectoral Nn.Nn. LongLong ThoracicThoracic NerveNerve • Derived from ventral rami of C5-C7 • Supplies serratus anterior superficially • (i.e., holds UL to thoracic wall) • Damage to this n. can occur during mastectomy • Results in “winged scapula” LongLong ThoracicThoracic NerveNerve ““WingedWinged ScapulaScapula”” LymphaticsLymphatics ofof thethe BreastBreast • Drain lymph from breast to series of nodes • Lat. drainage is via 5 groups of axillary nodes • Supr. drainage is via 1 group of interpectoral nodes • Med. drainage is via 1 group of parasternal nodes • Ultimate drainage is via subclavian lymph trunk to vv. • (i.e., jxn. of subclavian v. & IJV) LymphaticLymphatic DrainageDrainage LymphLymph NodesNodes ofof thethe BreastBreast • Pectoral (anterior) nodes • Subscapular (posterior) nodes • Humeral (lateral) nodes • Central nodes • Apical nodes • Interpectoral (Rotter’s) nodes • Parasternal nodes LymphLymph NodesNodes ofof thethe BreastBreast VascularVascular AssociationsAssociations ofof thethe BreastBreast LymphLymph NodesNodes • Pectoral – assoc. with lat. thoracic vessels • Subscapular – assoc. with subscapular vessels • Humeral – assoc. with distal (3rd) part of axillary v. • Central – assoc. with middle (2nd) part of axillary v. • Apical – assoc. with proximal (1st) part of axillary v. • Interpectoral – assoc. with pectoral vessels • Parasternal – assoc. with int. thoracic vessels VascularVascular AssociationsAssociations ClinicalClinical NotesNotes onon AxillaryAxillary LymphLymph NodeNode DissectionsDissections • 3 Levels of surgical dissections relative to pec. minor • (i.e., opposite arrangement of 3 parts of axillary vessels) • Level I – below (lateral to) pec. minor • Level II – deep to pec. minor • Level III – above (medial to) pec. minor PectoralisPectoralis MinorMinor DissectionsDissections ClinicalClinical SignificanceSignificance ofof BreastBreast LymphaticsLymphatics • Cancer cells tend to spread along lymph passages • Typical spread is supr./laterally to axillary lymph nodes • More than 75% of drainage via axillary lymph nodes • Most remaining drainage is medially to parasternal nodes • Unilateral lymphatic blockage may occur • Lymph (with cancer cells) can then drain to opposite side DrainageDrainage toto OppositeOpposite SideSide TheThe EndEnd ReferencesReferences • Agur, A.M.R. & A.F. Dalley. Grant’s Atlas of Anatomy, 12th Ed., Lippincott Williams & Wilkins, Baltimore, MD, 2009. • Clemente, C. Anatomy: A Regional Atlas of the Human Body, 5th Ed., Lippincott Williams & Wilkins, Baltimore, MD, 2006. • Moore, K.L., A.F. Dalley & A.M.R. Agur. Clinically Oriented Anatomy, 6th Ed., Lippincott Williams & Wilkins, Baltimore, MD, 2010. • Netter, F.H. The CIBA Collection of Medical Illustrations, Volume 2: Reproductive System. CIBA-Geigy, Summit, NJ, 1986. •Netter F.H. Atlas of Human Anatomy, 4th Ed., Saunders Elsevier, Philadelphia, PA, 2006. • Tank, P.W. Grant’s Dissector, 14th Ed., Lippincott Williams & Wilkins, Baltimore, MD, 2009..
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